src/hotspot/share/utilities/vmError.cpp

rev 50688 : 8205195: NestedThreadsListHandleInErrorHandlingTest fails because hs_err doesn't contain _nested_thread_list_max
Summary: Grab Threads_lock in VMError::controlled_crash() so ErrorHandling tests are more stable.
Reviewed-by:

*** 1696,1705 ****
--- 1696,1712 ----
    // which tests cases 1 thru 13.
    // Case 14 is tested by test/hotspot/jtreg/runtime/ErrorHandling/SafeFetchInErrorHandlingTest.java.
    // Case 15 is tested by test/hotspot/jtreg/runtime/ErrorHandling/SecondaryErrorTest.java.
    // Case 16 is tested by test/hotspot/jtreg/runtime/ErrorHandling/ThreadsListHandleInErrorHandlingTest.java.
    // Case 17 is tested by test/hotspot/jtreg/runtime/ErrorHandling/NestedThreadsListHandleInErrorHandlingTest.java.
+ 
+   // We grab Threads_lock to keep ThreadsSMRSupport::print_info_on()
+   // from racing with Threads::add() or Threads::remove() as we
+   // generate the hs_err_pid file. This makes our ErrorHandling tests
+   // more stable.
+   MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
+ 
    switch (how) {
      case  1: vmassert(str == NULL, "expected null"); break;
      case  2: vmassert(num == 1023 && *str == 'X',
                        "num=" SIZE_FORMAT " str=\"%s\"", num, str); break;
      case  3: guarantee(str == NULL, "expected null"); break;